根号[(3/sin20')-(1/cos20')],

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根号[(3/sin20'')-(1/cos20'')],根号[(3/sin20'')-(1/cos20'')],根号[(3/sin20'')-(1/cos20'')],√3/sin20°-1/cos20°=(√3

根号[(3/sin20')-(1/cos20')],
根号[(3/sin20')-(1/cos20')],

根号[(3/sin20')-(1/cos20')],
√3/sin20°-1/cos20°
=(√3cos20°-sin20°)/sin20°cos20°
=2(sin60°cos20°-cos60°sin20°)/sin20°cos20°
=2sin40°/0.5sin40°=4.